Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 398
The power ground is used to control ground circuits for the following PCM loads:
•
Generator field winding
•
Fuel injectors
•
Ignition coil(s)
•
Certain relays/solenoids
•
Certain sensors
SENSOR RETURN
The Sensor Return circuits are internal to the Powertrain Control Module (PCM).
Sensor Return provides a low–noise ground reference for all engine control system sensors. Refer to Power
Grounds for more information.
OPERATION
OPERATION - PCM
1. Also refer to Modes of Operation.
The PCM operates the fuel system. The PCM is a pre-programmed, triple microprocessor digital computer. It reg-
ulates ignition timing, air-fuel ratio, emission control devices, charging system, certain transmission features, speed
control, air conditioning compressor clutch engagement and idle speed. The PCM can adapt its programming to
meet changing operating conditions.
The PCM receives input signals from various switches and sensors. Based on these inputs, the PCM regulates
various engine and vehicle operations through different system components. These components are referred to as
Powertrain Control Module (PCM) Outputs. The sensors and switches that provide inputs to the PCM are consid-
ered Powertrain Control Module (PCM) Inputs.
The PCM adjusts ignition timing based upon inputs it receives from sensors that react to: engine rpm, manifold
absolute pressure, engine coolant temperature, throttle position, transmission gear selection (automatic transmis-
sion), vehicle speed and the brake switch.
The PCM adjusts idle speed based on inputs it receives from sensors that react to: throttle position, vehicle speed,
transmission gear selection, engine coolant temperature and from inputs it receives from the air conditioning clutch
switch and brake switch.
Based on inputs that it receives, the PCM adjusts ignition coil dwell. The PCM also adjusts the generator charge
rate through control of the generator field and provides speed control operation.
NOTE: PCM Inputs:
•
A/C request
•
Auto shutdown (ASD) sense
•
Battery temperature
•
Battery voltage
•
Brake switch
•
J1850 bus circuits
•
Camshaft position sensor signal
•
Crankshaft position sensor
•
Data link connections for scan tool
•
Engine coolant temperature sensor
•
Five volts (primary)
•
Five volts (secondary)
•
Fuel level
•
Generator (battery voltage) output
•
Ignition circuit sense (ignition switch in on/off/crank/run position)
•
Intake manifold air temperature sensor
•
Leak detection pump (switch) sense (if equipped)
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ELECTRONIC CONTROL MODULES - SERVICE INFORMATION
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•
Manifold absolute pressure (MAP) sensor
•
Oil pressure
•
Overdrive/override switch
•
Oxygen sensors
•
Park/neutral switch (auto. trans. only)
•
Power ground
•
Sensor return
•
Signal ground
•
Speed control multiplexed single wire input
•
Throttle position sensor
•
Transmission governor pressure sensor
•
Transmission temperature sensor
•
Vehicle speed (from ABS module)
NOTE: PCM Outputs:
•
A/C clutch relay
•
Auto shutdown (ASD) relay
•
J1850 (+/-) circuits for: speedometer, voltmeter, fuel gauge, oil pressure gauge/lamp, engine temp. gauge and
speed control warn. lamp
•
Data link connection for scan tool
•
EGR valve control solenoid (if equipped)
•
EVAP canister purge solenoid
•
Fuel injectors
•
Fuel pump relay
•
Generator field driver (-)
•
Generator field driver (+)
•
Generator lamp (if equipped)
•
Ignition coil
•
Natural Vacuum Leak detection Switch
•
Malfunction indicator lamp (Check engine lamp). Driven through J1850 circuits.
•
Overdrive indicator lamp (if equipped). Driven through J1850 circuits.
•
Oxygen sensor heater relays (if equipped).
•
Radiator cooling fan relay (pulse width modulated)
•
Speed control source
•
Speed control vacuum solenoid
•
Speed control vent solenoid
•
Tachometer (if equipped). Driven through J1850 circuits.
•
Transmission convertor clutch circuit
•
Transmission 3–4 shift solenoid
•
Transmission relay
•
Transmission temperature lamp (if equipped)
•
Transmission variable force solenoid
5 VOLT SUPPLIES
Primary 5-volt supply:
•
supplies the required 5 volt power source to the Crankshaft Position (CKP) sensor.
•
supplies the required 5 volt power source to the Camshaft Position (CMP) sensor.
•
supplies a reference voltage for the Manifold Absolute Pressure (MAP) sensor.
•
supplies a reference voltage for the Throttle Position Sensor (TPS) sensor.
Secondary 5-volt supply:
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ELECTRONIC CONTROL MODULES - SERVICE INFORMATION
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•
supplies the required 5 volt power source to the oil pressure sensor.
•
supplies the required 5 volt power source for the Vehicle Speed Sensor (VSS) (if equipped).
•
supplies the 5 volt power source to the transmission pressure sensor (if equipped with an RE automatic trans-
mission).
OPERATION - IGNITION CIRCUIT SENSE
The ignition circuit sense input tells the PCM the ignition switch has energized the ignition circuit.
Battery voltage is also supplied to the PCM through the ignition switch when the ignition is in the RUN or START
position. This is referred to as the
9
ignition sense
9
circuit and is used to
9
wake up
9
the PCM.
DIAGNOSIS AND TESTING
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NGC POWERTRAIN VERIFICATION TEST VER - 1
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
Diagnostic Test
1.
NGC POWERTRAIN VERIFICATION TEST VER - 1
NOTE: 1. If this vehicle is equipped with an Electron Throttle Control system, and the APP Sensors, PCM, or
Throttle Body Assembly have been replaced, use a scan tool to perform the ETC RELEARN function.
NOTE: 2. If the PCM or FCM have been replaced, the Pinion Factor MUST be programmed into the FCM.
While programming the Pinion Factor into the FCM the scan tool will send the Pinion Factor information to
the PCM at the same time. Refer to the scan tool for program procedure.
NOTE: 3. If the PCM has been replaced and the correct VIN and mileage have not been programmed, a DTC
will set in the ABS Module, Airbag Module and the SKIM.
NOTE: 4. If the vehicle is equipped with a Sentry Key Immobilizer System, Secret Key data must be updated.
Refer to the Service Information for the PCM, SKIM and the Transponder (ignition key) for programming
information.
5. Inspect the vehicle to ensure that all components related to the repair are properly installed and connected.
6. Inspect the engine oil for fuel contamination. Replace the oil and filter as necessary.
7. Attempt to start the engine.
8. If the No Start condition is still present, refer to the Engine Electrical Diagnostic list and perform the diagnostic
testing as necessary, refer to any Technical Service Bulletins that may apply.
9. Run the engine for one warm-up cycle to verify operation.
10. With the scan tool, confirm that no DTCs are present and that all components are functioning properly.
NOTE: The PCM can detect and compensate for variances in the engine and its components. To learn these
variations, the PCM uses the input of the actual crankshaft rotation pattern and ideal crankshaft rotation
pattern that has been calibrated into the PCM. The PCM then compares the two patterns. The variation
between the two values is the Adaptive Numerator. If the Adaptive Numerator is not learned by the PCM, the
misfire monitor will not run and the Multi-Cylinder Displacement System (MDS) will not operate. Without
MDS operation, the customer will experience decreased fuel economy. If the customer experiences decrease
fuel economy or after any repair use the scan tool to ensure that the Adaptive Numerator is learned.
Are any DTCs or symptoms remaining?
Yes
>> Check for any related Technical Service Bulletins and/or refer to the appropriate Diagnostic Procedure.
No
>> Repair is complete.
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